CN1993211B - Drives for mixing tanks - Google Patents

Abstract

The invention relates to a a gear unit for driving a drum of a transit mixer, which has at least one flexible element (17) that is disposed between the base (5) of the gear unit and a driving device (4) in order to compensate relative movements between the vehicle frame (2) and the drum (1), wherein includes a mechanism for confining movements of the driving device (4).

Description

Drives for mixing tanks

technical field

The invention relates to a drive for a mixing tank of the type defined in detail in claim 1, in particular for a mixing plant concrete-vehicle mixer.

Background technique

The drive of the truck mixer is used to feed the mixed material into the mixing tank in the "suction" direction of rotation and to discharge the mixed material from the mixing tank in the "empty" direction of rotation. In addition, the mixing tank is mounted on the rear of the car and above the driving device through two rolling bearings, so the driving device must receive the main part of the gravity of the mixing tank. When driving on uneven roads, the vehicle frame twists, so that the mixing tank moves relative to the vehicle frame and the movement above the drive must be allowed or compensated.

DE 100 33 661 A1 discloses a drive for a mixing tank, in which a hydraulic motor drives an inner sun gear of a planetary gearbox, whose outer sun gear constitutes the follower and drives the mixing tank. The gravity of the mixing tank is introduced into the housing through rolling bearings. When driving on an uneven road surface, the relative movement of the mixing tank relative to the vehicle frame is realized, for example, by self-aligning ball bearings in FIG. 1 .

Contents of the invention

It is an object of the present invention to provide a drive for a mixing tank which enables a relative movement between the mixing tank and the vehicle frame and is characterized by high operational safety and maintenance-free operation.

This object is achieved with a mixer tank drive according to the classification which also has the features of the main claim.

According to the invention, the drive unit is connected on the one hand to the mixing tank and on the other hand to a base which is likewise connected to the frame of the vehicle. Between the base and the driving device is an elastic element, through its deformation, the relative movement or compensation between the mixing tank and the vehicle frame can be made. Furthermore, the drive device has at least one component, which limits the movement of the drive device to disengage the drive device from the base. This prevents the drive from being lifted from the base, for example by alternating torque loads. The device for enabling a relative movement between the mixing tank and the vehicle frame preferably has a plurality of elastic elements which are arranged between parts which prevent the mixing tank or the drive unit from being lifted from the base. For this purpose, the part connected to the drive is U-shaped in order to accommodate the elastic element. The elastic elements between the arms of the "U" are interrupted by other parts connected to the base. The "U" shaped arms are constructed in such a way that the elastic elements can be mounted pretensioned.

In another embodiment, the elastic element is interrupted by the metal part or alternately coated with the metal part. This achieves the purpose of increasing the spring rigidity. The component that interrupts the elastic element and is fixedly connected to the base or is formed integrally with it has a circular gap into which the elastic element can be inserted. These parts additionally have a radial contact surface against which the further elastic element rests and is supported on the U-shaped part connected to the drive. The part that interrupts the spring element and connects it to the base has a further radial contact surface, on which the spring element bears and is connected to the connecting plate of the drive unit in order to absorb the forces of movement, in particular during braking and acceleration of the vehicle. By means of the drive unit having radial webs arranged uniformly around the center of the circle and supported on the contact surface by means of elastic elements, further contact surfaces that mechanically limit the rotation of the drive unit around the center can be formed between these radial webs and the contact surface . As a result, the torsional movement around the center is mechanically limited and the drive is prevented from being lifted from the base by the U-shaped part. Such an embodiment of the elastic element makes it possible to form the drive with hydraulic motor and transmission rigidly, so that a simple bearing construction can be produced by means of commercially available rolling bearings, such as tapered roller bearings. In order to make the drive with elastic elements compact, it is advantageous if at least one planetary gearbox is used as a transmission, the inner sun gear of which serves as the drive end and the outer sun gear of which forms the output and drives the mixing tank.

In particular, the disconnection between the vehicle frame and the drive of the mixing tank is achieved by means of the intermediate connection of the elastic elements, thereby reducing noise and vibrations.

In another embodiment, there is the possibility of arranging the elastic elements at the height of the frame, thereby shortening the base and lengthening the drive.

Description of drawings

For other features, refer to the description of the accompanying drawings. in:

Fig. 1 shows a kind of concrete mixer truck;

Figure 2 shows a drive with a radial piston motor;

Figure 3 shows a drive for an axial piston motor;

Figure 4 shows a view of the mechanism for making the movement between the base and the drive means possible;

Figure 5 shows a sectional view of the mechanism;

Figure 6 shows a bottom view of the drive unit; and

FIG. 7 shows a view of the central frustoconical receptacle of the spring element.

Detailed ways

figure 1:

The mixing tank 1 is supported on the vehicle frame 2 via roller bearings 3 on the one hand and via a drive 4 of the mixing tank on the other hand. The drive unit 4 is supported on a base 5 , wherein the base 5 is connected to the vehicle frame 2 .

figure 2:

A slow-running radial piston motor 6 drives an inner sun gear 8 of a planetary gearbox 9 with a rotor 7 . The planet carrier 10 is connected in a rotationally fixed manner to the housing 11 . The outer central gear 12 is connected with the driven flange 13 connected to the stirring tank 1 . The driven flange 13 is supported on the housing 11 via a bearing arrangement 14, in particular a tapered roller bearing arrangement. The housing 11 may have a support plate 15 suitable for receiving a water tank 16 . The drive device 4 is mounted displaceably on a component 18 via a spring element 17 . Part 18 is connected to base 5 or formed integrally therewith. The part 18 can be locked on the base 5 by means of an additional mechanical securing device, for example a pin 19 .

image 3:

The drive 4 differs from that of FIG. 2 only in that the inner sun gear 8 is driven by the planet carrier 20 of the second planetary gear stage 21 , the inner sun gear 22 of which is driven by an axial piston motor 23 . There is also the possibility of replacing radial piston motor 6 or axial piston motor 23 by an electric motor. Housing 11 has two flanged surfaces 24 and 25 , flanged surface 24 for flanged radial piston motor 6 and flanged surface 25 for flanged housing cover of planetary gear stage 21 .

Figure 4:

The figure shows, in an exploded view, a part of the mechanism that can bring about the movement between the base 5 and the drive 4 . The housing 11 is designed at its end close to the base 5 in such a way that it has two first radial webs 26 and two second radial webs 27 . A spring element 28 is embedded in the radial web 27 . Embedded in the radial web 26 is a spring element 29 which also has a spring element 30 which comes into contact with the bottom 31 of the housing 11 . The part 18 which is bolted to the base 5 and additionally locked by the central pin 19 has a contact surface 32 against which the spring element 29 rests and a contact surface 28 against which the spring element rests. All forces resulting from braking, accelerating or turning of the vehicle can thus be transmitted from the webs 26 and 27 via the elastic elements 28 and 29 and 30 to the contact surfaces 32 and 33 and from there into the base 5 . The gravity of the mixing tank is introduced into the component 19 through the bottom 31 and the elastic element 30 . When driving on an uneven road surface, the vehicle frame 2 and the shell 11 can overcome the torsion around the center 34 through the elastic element. The twisting around the center 34 is mechanically limited by a stop 35 which comes into contact with the U-shaped piece 35 . The part 18 has an intermediate support ring 37 which together with the contact surface 33 forms a gap 38 in which the spring element 39 engages. The spring elements 39 are preferably alternately coated with metal parts, whereby the spring rigidity can be increased. The preferably L-shaped part 40 is connected to the second radial connecting plate 27 in such a way that it together with this plate forms a U-shaped part 36 in which the elastic element 39, the supporting ring 37, the contact surface 33 and the elastic element 28 are arranged. . The U-shaped part 36 is preferably designed in such a way that the spring element 39 is pretensioned during installation. The U-shaped piece 36 prevents the drive device 4 from tipping over during the rotary movement, in particular when driving the mixing tank, since the torque for driving the mixing tank can be supported on the base 5 via the part 18 . U-shaped piece 36 likewise prevents lifting of housing 11 from base 5 in combination with elastic element 39 and carrier ring 37 , in particular during alternating torque loads.

In another embodiment, there is the possibility of constructing the housing 11 in multiple parts with radial webs 26 and 27 .

Figure 5:

The figure shows the setup of figure 4 in the installed state.

Figure 6:

The stop 35 of the radial web 26 can be twisted around the center 34 until it comes into contact with the U-shaped piece 36 . It is thus ensured that in the event of an overload of the elastic element there is mechanical contact during the twisting of the drive means 4 towards the base 5 and from the contact surface 33 to the U-shaped part 36 in relation to the movement of the drive means 4 towards the base 5 and thus preventing the elastic element from being overloaded .

This makes it possible to provide a maintenance-free, simple-design drive for the mixing tank, wherein the bearing arrangement 14 can be designed simply, since it does not require compensating movements between the mixing tank 1 and the frame 2 and can thus be constructed in a compact manner. drive unit.

reference sign

1 mixing tank

2 car frame

3 Roller bearings

4 drive device

5 base

6 radial piston motor

7 rotor

8 inner sun gear

9 planetary gearbox

10 planetary gear carrier

11 shell

12 Outer sun gear

13 driven flange

14 Bearing structure

15 support plate

16 water tanks

17 Elastic elements

18 parts

19 pins

20 planetary gear carrier

21 planetary gear stages

22 inner sun gear

23 axial piston motor

24 flange connection surface

25 flange connection surface

26 The first radial connecting plate

27 Second radial connecting plate

28 Elastic elements

29 Elastic elements

30 Elastic elements

31 Bottom

32 contact surface

33 contact surface

34 centers

35 stop

36 U-shaped pieces

37 support ring

38 clearance

39 Elastic elements

40 parts

Claims (9)

1. the drive unit of an agitator tank, this drive unit is connected with agitator tank (1) on the one hand, so that on the meaning that rotatablely moves, drive agitator tank (1) and be formed for absorbing the bearing arrangement (14) of agitator tank (1) gravity, and be connected with the base (5) of last surface bearing gravity on the other hand, have and to make the mechanism that produces motion between base (5) and the drive unit (4), wherein, this mechanism has at least one flexible member (28,29,30,39), can produce motion by its distortion, wherein, flexible member (28,29,30,39) be arranged between drive unit (4) and the base (5), it is characterized in that, the gravity of agitator tank has at least one parts (36) by flexible member supporting and drive unit (4), the motion that drive unit (4) and base (5) are broken away from of this component limitations drive unit (4), the torque load of drive unit (4) can be bearing on the base (5) thus.

2. by the drive unit of the described agitator tank of claim 1, it is characterized in that flexible member (39) has additional metal level.

3. by the drive unit of profit requirement 1 described agitator tank, it is characterized in that, this mechanism has the connecting plate radially (26,27) that distributes and be provided with around a center (34), described connecting plate is bearing in radially on the contact-making surface (32,33) by flexible member (28,29), and wherein said contact-making surface (32,33) is connected with base (5).

4. the drive unit of the described agitator tank of claim 3 is characterized in that, constitutes at least two radially connecting plates (27), thus the motion that drive unit (4) and base (5) are broken away from of restriction drive unit (4).

5. press the drive unit of the described agitator tank of claim 4, it is characterized in that, radially connecting plate (27) forms a U-shaped spare with restraint device (40), and flexible member (39) is set between them, and wherein said flexible member (39) interrupts by parts (18) that are connected with base (5).

6. by the drive unit of the described agitator tank of claim 5, it is characterized in that, be arranged in this U-shaped spare by U-shaped spare (36) flexible member (39) elasticity on pre-tensioned meaning.

7. by the drive unit of the described agitator tank of claim 5, it is characterized in that the parts (18) that interrupt flexible member (39) have the circular gap (38) that the inside can be provided with flexible member (39).

8. by the drive unit of the described agitator tank of claim 7, it is characterized in that the flexible member (39) that is arranged in the gap (38) alternately adopts the metalwork coating.

9. by the drive unit of the described agitator tank of claim 5, it is characterized in that the parts (18) that interrupt flexible member (39) are fixedlyed connected with base (5).

Images